<<If I have to believe you, traffic congestion never occurs on LHR TWR freq. Even if I haven't been to LHR in the last 10 years, I find that hard to believe! Or is LHR twr freq really that much calmer then BRU, FRA, MUC, AMS or CDG?>>
Heathrow Tower is not involved!!!!!! It's the radar controllers who put aircraft on the ILS. Good God man, you don't even know how the system works!
It's pointless arguing. I've seen aircraft "cleared for the ILS" descend to well below the glidepath. Under the ILS at many airfields there is other traffic which has to be protected. The UK made an attempt to solve this problem, which really did work.
I'm not getting involved any further.